Elkay T-Mixer shower valve, with A51866R cartridge
https://www.plumbersstock.com/elkay...MItMvb-aWb6gIVXhitBh2azgmbEAQYBiABEgKKfPD_BwE
https://www.plumbersstock.com/elkay...MItMvb-aWb6gIVXhitBh2azgmbEAQYBiABEgKKfPD_BwE